622 POACE^. 



Nearly allied to B, hreviai'istatus. The italicized words above 

 mark the most distinctive points which separate this from B. 

 breviaristatus. 



Eocky Mountains, Colorado to Montana. 



Yar. Tweedyi Scribn. ined. 



Panicle villous, smaller, rather slender, more jjubescent. 



Montana, Tweedy 587. 



21. B. ASPER Murr. Prod. Stirp. Gott. 42 (1770). B. altis- 

 sinms^Veb. Wigg. Prim. Fl. Hols. 9 (1780), teste Kunth. Festuca 

 aspera M. &. K. Deutsch. Fl. J : G72 (1823). 



An erect annual or perennial, 60-150 cm. high. Sheaths 

 clothed more or less with reflexed hairs; ligule short; blades 5-6, 

 flat, scabrous or thinly pubescent, 3-4 cm. long, 5-8 mm. wide. 

 Panicle open, 8-15 cm. long, lowest rays scabrous, mostly in twos 

 and threes, the longest 8-10 cm. long, branched sparingly. Spike- 

 lets oblong or lanceolate, compressed, 6-10-flowered, 2-3 cm. 

 long, joint of rachilla scabrid, with few hairs, 3.5 mm. long ; 

 first empty glume lanceolate, 1-nerved, 6 mm. long, second oval- 

 lanceolate, 3-nerved, 9 mm. long, with the apex mucronate; 

 floral glume scabrid, hairy, elliptical-lanceolate, 5-7-nerved, 13 

 mm. long including the very short teeth, awn 5-8 mm. long; palea 

 narrowly oblanceolate, short-ciliate on the keels, 9-10 mm. long. 



Michigan (near Lansing), Bailey in 1886. 



Introduced from Europe. 



22. B. Orcuttianus Vasey, Coult. Bot. Gaz. 10:223 (1885). 

 An erect perennial, leafy below, scabrous above, 90-120 cm. 



high; nodes pubescent. Sheaths pubescent; ligule firm, 1 mm. 

 long; blades 4, besides several crowded near the base of the culm, or 

 8 on tall plants from the forest, erect, firm, nearly smooth, 10-15- 

 30 cm. long, 5-9 mm. wide. Panicle erect, thin, 10-15 cm. long, 

 rays in twos and threes, the longest 3-5 cm. long, not including 

 the 2-3 spikelets, spreading. Spikelets 4-8-flowered, longest joint 

 of rachilla scabrous, 3.5 mm. long, first empty glume linear, acute, 

 1-3-nerved, 7 mm. long, second linear, almost acute, 3-nerved, 9- 

 11 mm. long; floral glume scabrous-pubescent, round on the back, 

 lance-elliptical, 5-7-nerved, 10-12 mm. long, apex entire, obtuse, 



